As someone who makes it a priority to remember the birthdays of friends, clients, and colleagues, I was delighted to find that Trader Joe's carries some wonderful birthday cards for 99 cents. The line - Gourmet Greeting Cards - is printed on recycled paper with soy-based inks. The only thing about these cards that bummed me out is that each of them comes inside of a cellophane wrapper. Isn't that a little contradictory to the other aspects of the card?
Anyway, if you are freaked out by the rising cost of birthday cards in stores like Papyrus, Trader Joe's is a good alternative, even if the selection is way smaller.